The theoretical description of photorefractive vectorial two-wave coupling in cubic crystals with an applied square-wave electric field is carried out in the low-intensity limit on the basis of self-consistent system of coupled wave equations for amplitudes of light waves and the equation for space charge field amplitude. The analytical solution obtained in approximation of a small-contrast interference grating is valid for any ratio between the period of applied field and the Maxwell relaxation time just as for polarization parameters of light waves. It is shown that the temporal dependency of the photorefractive grating amplitude in BTO and BSO crystals changes considerably with increasing interaction length. This behavior in the case of amplification of intensity of weak light wave is different from the case of attenuation. At elliptical polarization of the light wave on the entrance face of a crystal with two-wave coupling gain has temporal modulation even if the period of applied field is much less than Maxwell’s relaxation time. The reason of this is the change of polarization parameters of the light wave with switching of the applied field. The value of the time-average space-charge field amplitude taking into account this effect is different from the value calculated using well- know expression obtained by Stepanov et al.

© 2001 Optical Society of America

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